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Technical guide

Resilient Village Power: NEUTRON Protection Scope at Menjez

The Menjez community solar system gives a rural Lebanese village resilient local power through PV and storage. NEUTRON supplied the DC protection on the array side and the residual-current protection on the AC side, with the battery and inverter integrated by the operator.

NEUTRON Engineering TeamUpdated September 16, 20264 min readTechnical application guidance
Small ground-mounted solar array on a stone-supported terrace beside a generic Lebanese village
Fig. 0 — Small ground-mounted arrays can integrate with village-scale electricity infrastructure.

Key takeaways

  • The DC-plus-AC protection approach cut protection-related downtime and removed the shock-risk gap, supporting village loads through the seasons.
  • Treat headline ratings as an engineering input, then confirm the final configuration against the project drawings and applicable local requirements.
  • Keep the approved component list, critical interfaces and required test or document deliverables visible before production begins.

1. Village-scale solar

A small community array pairs with storage and an inverter feeding local AC loads. Protection has to work on both the DC and AC sides and be coordinated so a fault on one side does not take down the other.

2. DC side protection

  • A DC isolation switch at the array combiner for safe maintenance.
  • gPV fuses protecting each string against short circuit and reverse current.
  • A DC-rated SPD where lightning exposure is significant.
Isolated unmarked fuse holder fuse cartridge rotary disconnector and surge protection module arranged on a studio tabletop
Fig. 1 — Fuse holders, isolation switches and surge modules have distinct roles in array-side protection.

3. AC distribution board: Type B RCBO

On the AC side NEUTRON installed Type B RCBO units combining residual-current protection with overcurrent protection. Because the inverter can present smooth DC, Type B closes the protection gap left by a Type A device.

Oblique view of an unwired AC demonstration enclosure with separate covered terminal bars and an open outer door
Fig. 2 — Physical organization and accessible protection devices support inspection of an AC distribution assembly.

4. Nuisance trip avoidance

  • Correct Type B threshold sizing.
  • Clean array earthing.
  • No mixed neutral-earth loops.

5. Outcome

The DC-plus-AC protection approach cut protection-related downtime and removed the shock-risk gap, supporting village loads through the seasons.

Project paths

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Engineering boundary

Final ratings, coordination, installation and applicable local requirements must be verified against current standards, manufacturer documentation and the approved project design.

Frequently asked questions

Why Type B RCD for village solar?

The inverter can inject smooth DC that a Type A RCD cannot detect; Type B senses AC, pulsating DC and smooth DC.

What causes microgrid RCBO nuisance trips?

Humid mornings, array parasitic capacitance and mixed neutral-earth loops; correct sizing and clean earthing resolve most.

What can one system serve?

Depending on array and storage size, it can power local homes, lighting and a water pump for a village cluster.

Which NEUTRON products fit?

DC isolator plus gPV fuse combiners, Type B RCBO or RCCB, coordinated DC SPD and a compact low-voltage distribution assembly.

Review the AC and DC boundaries together.

Share the array, inverter and village-load requirements for a coordinated protection review.

Discuss a project
NE
NEUTRON Engineering TeamPower distribution and new-energy equipment for project-based export supply.

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Technical review note

Published from the approved Period 12 source package; project, technical and standards statements are retained from the supplied publication content.